using exists with coef from an arima fit
On 2/11/2009, at 5:27 PM, Erin Hodgess wrote:
Dear R People: I have the output from an arima model fit in an object xxx. I want to verify that the ma1 coefficient is there, so I did the following:
xxx$coef
ar1 ar2 ma1 intercept 1.3841297 -0.4985667 -0.9999996 -0.1091657
str(xxx$coef)
Named num [1:4] 1.384 -0.499 -1 -0.109 - attr(*, "names")= chr [1:4] "ar1" "ar2" "ma1" "intercept"
exists('xxx$coef["ma1"]')
[1] FALSE
Other than using xxx$coef[3], is there another way to check this, please?
(1) as.logical(length(grep("ma1",names(xxx$coef)))
(2) length(grep("ma1",names(xxx$coef))) != 0
(3) with(as.list(xxx$coef),exists("ma1"))
spring to mind.
cheers,
Rolf
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